I see the following ICE:

$ arm-linux-gnueabi-gcc /home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/compile/950612-1.c -fno-dce -O3 -c
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/compile/950612-1.c:17:1: warning: return type defaults to ‘int’ [-Wimplicit-int]
   17 | f (pc)
      | ^
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/compile/950612-1.c: In function ‘f’:
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/compile/950612-1.c:116:3: warning: implicit declaration of function ‘printf’ [-Wimplicit-function-declaration]
  116 |   printf("shift = %d\n", shift);
      |   ^~~~~~
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/compile/950612-1.c:116:3: warning: incompatible implicit declaration of built-in function ‘printf’
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/compile/950612-1.c:1:1: note: include ‘<stdio.h>’ or provide a declaration of ‘printf’
  +++ |+#include <stdio.h>
    1 | typedef enum
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/compile/950612-1.c:132:7: warning: incompatible implicit declaration of built-in function ‘printf’
  132 |       printf("%08lx.%08lx\n", (long)(((unsigned long long) acc) >> 32) , (long)(((unsigned long long) acc) & 0xffffffff));
      |       ^~~~~~
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/compile/950612-1.c:132:7: note: include ‘<stdio.h>’ or provide a declaration of ‘printf’
during RTL pass: cse_local
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/compile/950612-1.c:134:1: internal compiler error: in insert_regs, at cse.c:1129
  134 | }
      | ^
0x5a4b07 insert_regs
	/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-arm/build/gcc/cse.c:1129
0x10e97a8 cse_insn
	/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-arm/build/gcc/cse.c:5956
0x10ebac4 cse_extended_basic_block
	/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-arm/build/gcc/cse.c:6614
0x10ebac4 cse_main
	/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-arm/build/gcc/cse.c:6793
0x10ec74d rest_of_handle_cse_after_global_opts
	/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-arm/build/gcc/cse.c:7765
0x10ec74d execute
	/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-arm/build/gcc/cse.c:7816
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.